now, this has happened before, bill clinton shook fidel castro's hand. >> also today, president obama warmly greeted the brazilian president. he has not been happy with the u.s. so another chillily relationship by the afghan president, the two leaders actually sat near each other and briefly chatted at 1 point. he has been very critical of the u.s., and has refused to sign a security deal. now in the past they haven't necessarily led anywhere, back in 2009 there was this awkward hand shake. the venezuelan president who then gave mr. obama a book, in that same area, the president got a lot of criticism for vowing to the saudi king, right here, at a u.s. it is a no-no for presidents. he said it wasn't so much a bow as the president tries to shake hands. to show you how chummy world presidents can be, even the president is not above taking selfies. he pose to snap a pick of himself at mandela's memorial, he has been getting a lot of grief for that, and i think the best reaction, is one of the first lady, she was not include sod like we have been talking about this, we will show you. >> w